Temperature control of refrigerating-compartments.



f Hartford, in the inviamo srarns Parana oriana.

ALBERT MARSHALL, OF HARTFORD, CONNECTICUT, ASSIGNOR T0 THE AUTOMATICREFRIGERATIN G COMPANY, 0F HARTFORD, CONNECTICUT,

JERSEY.

TEMPERATURE CONTROL 0F REFRIGERATING-COMPARTMENTS.

Specication of Letters Patent.

A CORPORATION 0F NEW To all whom t may concern.'

Be it known that I, ALBERT T. MARSHALL, a citizen of the United States,residing at county of Hartford and State of Connecticut, have inventedcertain newand useful Improvements in Temperature Control oflRefrigerating-Compartments in Refrigeratin i the following is a'specification.

The novelty of my invention resides in the varying of the brine level ina tank ir which the refrigerating coils are placed and in therebyinterposing more or less of this heat conducting medium between therefrigerating coil and the air in the compartment so that for instancewhen the tank is filled with brine so that the refrigerating coil iscompletely submerged therein its full capacity will be utilized incooling the brine whereas if the brine level is lowered andk only asmall portion of the coil is submerged therein while the rest of it isinsulated by pocketed and non-circulating air in the tank from therefrigerating compartment, only a small portion of the coil will haveeffect on the compartment.

In the accompanying drawings I have illustrated how my invention may bereduced to practice. A

In these drawings: Figure 1 is a longitudinal sectional elevation ofthree refrigerating compartments, and Fig. 2 is a transverse sectionalelevation of compartment 12.

In these drawings l0, 11 and l2 represent three refrigeratingcompartments which may be of varying sizes as shown. In the upperportion of each compartment is disposed a metal tank 13 adapted tocontain brine or L other suitable liquid with a loW freezing point. Iprefer to use strong brine. The iquid is supplied to the tanks throughmain 16 which passes through all the chambers, the

supply being controlled by hand valve 17.

The brine may be drawn" from each tank until the desired level wastevalve'18.

In each of tanks A13 is placed a refrigerat-V ing coil 14 which issuppliedwith refrigerant from lthe main 1 The refrigerating coils 14 areconnected to the all the coils which are in operation are in series. Forthis purpose in the two ends of each coil near the polnt where they jointhe maln 19 are .disposed hand valves 4 and 5 is reached by openingSystems, of which and brine supplied ,ment shou main 19 so that' valvel, 2 and 3 respectively is interposed in main 19. The refrigerant flowsthrough main 19 in the direction as indicated by the arrow in Fig. 1. llnow be seen that when all hand valves 1, 2 and 3 in main 19 lare closed,but valves 4 and 5 of each coil are open, refrigerant will pass throughall three coils in series. If it is desired, for instance, to cut therefrigerant off from one of the coils for instance coil 14 in chamber11, hand valve 2 is first opened and. then valves 4 and 5 of coil 14 areclosed. In consequence'the refrigerant will pass di- .rectly throughbypass valve 2 without passing. through coil 14 in chamber 1l. Thus anyof the chambers may 'be entirely cut off from refrigerant.

The operation of this system is as follows:

Assuming lthat all three coils are open and their respective bypasses l,2 and 3- closed so that the refrigerant passes through all the coils inseries as described and assuming that each of the com artments l0, 11and l2 should have difildrent temperature; then brine valve 17 in eachchamber is opened to tank 13 until a certain level is reached. The brinebeing cooled by the refrigerating coils submerged therein will in turn,owing to .the large surface of the metal tank, form a very effectivecoolin medium for the compartment. Should the temperature in thecompartment be still above the desired one, the brine level in that tankis raised by again opening-hand valve 17 which submerges more turns ofrefrigerating coil 14 in this tank. Consequently a larger portion of therefrigerating coilI becomes effective so that the temperature of thebrine in this tank is lowered and also thebrinelevel being raised inthis tank a larger effective cooling surface is exposed to the airsurrounding the tank. If, on the other hand the temperature' of thecompartd be too low, brine waste valve 18 is opened and brine withdrawn`from the tank. Thus less turns of'refrigerating coil 14 becomeeffective in cooling the brine, the

.rest of the turns which are not submerged being most effectivelyinsulated by the tank walls and the air contained therein from the aircontained in the compartment.l Moreover now less'of the metallic tanksurface is cooled by brine and Patented Jan. 16,1912. Application flledJuly 301910. Serial No. 574,684.

thus the effect of the,

' coil on the temperature of the compartmentll ductor incasing said coiland having heat is lessened. -I have found'that in practice conductiveconnection with said coil an by thus changing the brine level in thesevmeans for varying the extent of said coneral compartments a verysatisfactory and nection with the coil. uniform refrigeration of thecompartment 4. In a refrigerating chamber the combimay be obtained. Ifit is required to cut nation With a refrigerating coil disposed out therefrigerationin'o'ne or several com- 'therein, a metal tank in saidchamber in partments the refrigerant supply is cutoi `Which said 'coilis disposed, said tank adapt- 'as described above. ed to containnon-freezing iuid, and means What I claim is: for varying the level ofthe fluid in said `1. Ina refrigerating chamber, the combitank tosubmerge more or less turns of said nation with a Arefrigeratin coildisposedv Coil therein. I therein, through the Whole lqength of which 5.In a refrigerating chamber the combithe refrigerant passes, and meansfor innation With a refrigerating' coil disposed creasing andAdecreasing `the effective area therein, a metal tank in said chamber inof said coil, While its entire length is travwhich said coil isdisposed, said tank adaptersed by the refrigerant. ed to contain brine,means for supplylng 2. In a refrigerating chamber, the combibri'ne toNand draining it from said tank to nation of a refrigerating coil forconducting vary the brine level and thus the number of a lcontinuousiow' of refri erant through turns of said coil submerged in the brine atits entire length and means I sulating portions of said' coil; from saidof Said Coil I' the purpose Set forthchamber. LBERT T. MARSHALL. 3. `Ina refrigerating chamber, the combi- Witnesses: nation of a refrigeratincoil for conducting HARRY E. KNIGHT,

a continuous ow of re rigerant, 4a heat con- M. G. CRAWFORD.

or variably m. will to increase or decrease the eective area l

